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首页> 外文期刊>Journal of mass spectrometry: JMS >Observations of different core water cluster ions Y~-(H _2O)_n (Y = O_2, HO_x, NO_x, CO_x) and magic number in atmospheric pressure negative corona discharge mass spectrometry
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Observations of different core water cluster ions Y~-(H _2O)_n (Y = O_2, HO_x, NO_x, CO_x) and magic number in atmospheric pressure negative corona discharge mass spectrometry

机译：大气负电晕放电质谱法中不同核心水团离子Y〜-（H _2O）_n（Y = O_2，HO_x，NO_x，CO_x）和幻数的观测

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Reliable mass spectrometry data from large water clusters Y ~-(H_2O)_n with various negative core ions Y ~- such as O_2~-, HO~-, HO _2~-, NO_2~-, NO_3~-, NO_3~-(HNO_3)_2, CO _3~- and HCO_4~- have been obtained using atmospheric pressure negative corona discharge mass spectrometry. All the core Y- ions observed were ionic species that play a central role in tropospheric ion chemistry. These mass spectra exhibited discontinuities in ion peak intensity at certain size clusters Y~-(H_2O) m indicating specific thermochemical stability. Thus, Y ~-(H_2O)_m may correspond to the magic number or first hydrated shell in the cluster series Y~-(H_2O) _n. The high intensity discontinuity at HO~-(H _2O)_3 observed was the first mass spectrometric evidence for the specific stability of HO~-(H_2O)_3 as the first hydrated shell which Eigen postulated in 1964. The negative ion water clusters Y~-(H_2O)_n observed in the mass spectra are most likely to be formed via core ion formation in the ambient discharge area (760 torr) and the growth of water clusters by adiabatic expansion in the vacuum region of the mass spectrometers (≈1 torr). The detailed mechanism of the formation of the different core water cluster ions Y~-(H ~2O)n is described.
机译：来自大型水团Y〜-（H_2O）_n和各种负性核心离子Y〜-的可靠质谱数据，例如O_2〜-，HO〜-，HO _2〜-，NO_2〜-，NO_3〜-，NO_3〜-（使用大气压负电晕放电质谱法获得了HNO_3）_2，CO_3〜-和HCO_4〜-。观察到的所有核心Y离子都是在对流层离子化学中起核心作用的离子物种。这些质谱在某些尺寸簇Y〜-（H_2O）m处显示出离子峰强度的不连续性，表明特定的热化学稳定性。因此，Y〜-（H_2O）_m可以对应于簇系列Y〜-（H_2O）_n中的幻数或第一水合壳。观测到的HO〜-（H _2O）_3处的高强度不连续性是HO〜-（H_2O）_3作为本征于1964年提出的第一个水化壳的特定稳定性的第一个质谱证据。负离子水簇Y〜在质谱图中观察到的-（H_2O）_n最有可能是通过环境放电区域中的核心离子形成（760 torr）以及在质谱仪的真空区域中通过绝热膨胀引起的水团簇的生长而形成的（≈1torr） ）。描述了形成不同核心水团离子Y〜-（H〜2O）n的详细机理。

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